One thing that carries a lot of shows is the performer being confidant. Standing tall and doing what they do with authority, even if what they are doing isn’t very good. Recently I saw an act where the performer’s confidence carried the show.
He told some jokes and did some singing:
His character was a space alien. He delivered his lines like they were the best lines ever, and people seemed to pay attention. In my opinion what carried the act was him selling the material like it was amazing, also a very friendly audience really helped.
However had he done his material with any doubt that it wouldn’t hit, the act really would have been rough. So go out there and portray confidence in your material!